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Note 16 - Customers (Tables) | 12 Months Ended
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Dec. 31, 2012
Schedule of Revenue by Major Customers by Reporting Segments [Table Text Block] |
| Years Ended December 31, |
| 2012 |  |  | 2011 |  |  | 2010 |
| Amount |  |  | % |  |  | Amount |  |  | % |  |  | Amount |  |  | % |
Texas Department of Transportation (“TxDOT”) |  | $ | * |  |  |  | * | % |  | $ | 75,818 |  |  |  | 15.1 | % |  | $ | 95,198 |  |  |  | 20.7 | %
Utah Department of Transportation (“UDOT”) |  |  | 100,658 |  |  |  | 16.0 |  |  |  | 144,398 |  |  |  | 28.8 |  |  |  | 120,492 |  |  |  | 26.2 |
California Department of Transportation (“Caltrans”) |  |  | 94,171 |  |  |  | 15.0 |  |  |  | * |  |  |  | * |  |  |  | * |  |  |  | * |

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- Definition No authoritative reference available. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration